STREAM AND ROYALTY INTERESTS, NET - Summary (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Aug. 11, 2021	Aug. 06, 2021	Jun. 30, 2021	Jun. 07, 2021	Jun. 30, 2020
Cost	$ 3,899,867			$ 3,618,802		$ 3,553,950
Accumulated Depletion	(1,456,115)			(1,356,644)		(1,233,696)
Impairments						(1,341)
Net	2,443,752			2,262,158		2,318,913
Wassa
Net	61,600
Red Chris
Cost		$ 165,000
Cote
Net					$ 75,000
NX
Cost			$ 100,000
Production Stage Royalty and Stream Interests [Member]
Cost	3,369,499			2,939,871		3,018,837
Accumulated Depletion	(1,456,115)			(1,356,644)		(1,233,696)
Impairments						(1,341)
Net	1,913,384			1,583,227		1,783,800
Production stage stream interests
Cost	2,419,936			2,111,423		2,111,423
Accumulated Depletion	(878,902)			(796,299)		(645,705)
Net	1,541,034			1,315,124		1,465,718
Production stage stream interests | Mt. Milligan
Cost	790,635			790,635		790,635
Accumulated Depletion	(336,921)			(300,378)		(236,352)
Net	453,714			490,257		554,283
Production stage stream interests | Pueblo Viejo
Cost	610,405			610,404		610,404
Accumulated Depletion	(260,321)			(243,706)		(203,935)
Net	350,084			366,698		406,469
Production stage stream interests | Andacollo
Cost	388,182			388,182		388,182
Accumulated Depletion	(139,035)			(131,578)		(110,521)
Net	249,147			256,604		277,661
Production stage stream interests | Khoemacau
Cost	239,411
Accumulated Depletion	(3,402)
Net	236,009
Production stage stream interests | Rainy River
Cost	175,727			175,727		175,727
Accumulated Depletion	(50,115)			(41,772)		(27,278)
Net	125,612			133,955		148,449
Production stage stream interests | Wassa
Cost	146,475			146,475		146,475
Accumulated Depletion	(84,915)			(78,865)		(67,619)
Net	61,560			67,610		78,856
Production stage stream interests | Other Mines
Cost	69,101
Accumulated Depletion	(4,193)
Net	64,908
Production stage royalty interest
Cost	949,563			828,448		907,414
Accumulated Depletion	(577,213)			(560,345)		(587,991)
Impairments						(1,341)
Net	372,350			268,103		318,082
Production stage royalty interest | Voiseys Bay
Cost	205,724			205,724		205,724
Accumulated Depletion	(113,602)			(109,850)		(101,381)
Net	92,122			95,874		104,343
Production stage royalty interest | Red Chris
Cost	116,187	116,200
Net	116,187
Production stage royalty interest | Penasquito
Cost	99,172			99,172		99,172
Accumulated Depletion	(53,022)			(50,176)		(44,614)
Net	46,150			48,996		54,558
Production stage royalty interest | Cortez
Cost	80,681			80,681		80,681
Accumulated Depletion	(23,225)			(19,128)		(15,065)
Net	57,456			61,553		65,616
Production stage royalty interest | NX
Cost			54,900
Production stage royalty interest | Other Mines
Cost	447,799			442,871		521,837
Accumulated Depletion	(387,364)			(381,191)		(426,931)
Impairments						(1,341)
Net	60,435			61,680		93,565
Development stage royalty and stream interest
Cost	112,213			335,717		219,597
Net	112,213			335,717		219,597
Development stage stream interest | Khoemacau
Cost				223,502		136,608
Net				223,502		136,608
Development stage stream interest | Other Mines
Cost	12,037			12,037		12,037
Net	12,037			12,037		12,037
Development stage royalty interest | Cote
Cost	45,421			45,423
Net	45,421			45,423
Development stage royalty interest | Other Mines
Cost	54,755			54,755		70,952
Net	54,755			54,755		70,952
Exploration Stage Stream and Royalty Interests
Cost	418,155
Net	418,155
Exploration Stage Stream Interests | NX
Cost	30,974
Net	30,974
Exploration stage royalty interest
Cost				343,214		315,516
Net				343,214		315,516
Exploration stage royalty interest | Red Chris
Cost	48,895	$ 48,900
Net	48,895
Exploration stage royalty interest | Cote
Cost	29,610			29,610
Net	29,610			29,610
Exploration stage royalty interest | NX
Cost			$ 45,100
Exploration stage royalty interest | Pascua Lama
Cost	177,690			177,690		177,690
Net	177,690			177,690		177,690
Exploration stage royalty interest | Other Mines
Cost	130,986			135,914		137,826
Net	$ 130,986			$ 135,914		$ 137,826